login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A083411 a(n) = Sum(((k-1)/2)*k!*Stirling_2(n,k),k=1..n). 2
0, 1, 9, 79, 765, 8311, 100989, 1362439, 20246445, 328972471, 5805917469, 110645911399, 2265191981325, 49589790516631, 1156201277261949, 28605950745797959, 748605590542359405, 20661245832389468791, 599820758571599742429, 18272940402442730318119, 582867486201919540724685 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..21.

FORMULA

E.g.f.: (1/2)*( (1-exp(x))/(2-exp(x)) )^2.

CROSSREFS

Equals A083384(n)/n.

Sequence in context: A163445 A190979 A254598 * A181279 A173808 A293723

Adjacent sequences:  A083408 A083409 A083410 * A083412 A083413 A083414

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jun 08 2003

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 5 09:46 EDT 2020. Contains 333239 sequences. (Running on oeis4.)